A2L Refrigerant

A2L Field Reference Guides

R-410A is out. R-454B, R-32, and R-452B are in. Seven guides covering everything you need to know — flammability, tools, handling rules, retrofit guidance, and code compliance. Written for techs, not engineers.

7 Guides
Everything A2L, One Place
All guides are free. No signup. Reference them from the field.
Start Here — Overview
What Is A2L Refrigerant? Complete Field Guide
What A2L means, which refrigerants qualify, flammability classification, what changes on the job, and what doesn't. The foundation guide before reading anything else.
Read guide →
Comparison
R-454B vs R-410A: What Actually Changes
Pressures, oil type, leak detection requirements, charging procedure differences, and tool compatibility — side-by-side so you know exactly what to expect on the first R-454B job.
Read guide →
Safety
Is R-454B Flammable? The Real Answer
The 3 conditions required for ignition, risk by application type, what the A2 classification actually means in practice, and a customer explainer script for homeowners who ask.
Read guide →
Tools
What Leak Detector Works for A2L Refrigerants?
Not all detectors are rated for A2L. Which brands and models are confirmed compatible, what to look for on the label, and why your R-410A detector may not cut it.
Read guide →
Equipment
Can I Use My Recovery Machine on A2L?
Recovery machines rated for A2L refrigerants, what the certification means, which machines need replacement, and what to do if you're on a job with incompatible equipment.
Read guide →
Field Procedures
A2L Handling Rules by Job Type
Attic installs, closet installs, commercial rooftops, commercial indoor units, and mini-splits — handling rules are not one-size-fits-all. What each scenario requires.
Read guide →
Retrofit
R-410A Systems: Retrofit or Replace?
The drop-in question answered directly, what the R-22 transition taught us, when manufacturer retrofit kits make sense, and how to have the conversation with customers.
Read guide →

35-Node A2L Guide in the App

The app has an interactive A2L section covering all of the above plus refrigerant profiles, EPA 608 reference, ASHRAE 15 compliance, and a customer explainer mode. Free. Offline. No signup.

Open Fieldmode →